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A 10 MW, 140 GHz ECH system is currently under construction for the stellarator W7-X. The RF power will be provided by 10 tubes. A European collaboration has been established to develop and build 9 (out of 10) gyrotrons each with an output power of 1 MW for continuous wave (CW) operation. This contribution reports on recent results with the series gyrotrons.
Summary form only given. During the last years electron cyclotron heating (ECH) has proven to be one of the most attractive heating schemes for stellarators, as it provides net current free plasma start up and heating. Both, the stellarator Wendelstein 7-X (W7-X), which is under construction at IPP-Greifswald, Germany, and the ITER tokamak, which will be built at Cadarache, France, will be equipped...
Electron-cyclotron-resonance heating (ECRH) is an important heating system for the stellarator W7-X. For this system a total power of 10 MW at 140 GHz is needed in 30 min operation. In a collaboration with European research laboratories and European tube industry (Thales Electron Devices (TED) in France), cylindrical cavity gyrotrons designed for an output power of 1 MW, CW at 140 GHz have been developed...
The first series tube of the gyrotrons for the 10-MW electron cyclotron resonance heating system of the stellarator W7-X was tested at Forschungszentrum Karlsruhe (FZK) and yielded a total output power of 0.98 MW, with an efficiency of 31% (without a single-stage depressed collector) in short-pulse operation and of 0.92 MW in pulses of 180 s (efficiency of almost 45% at a depression voltage of 29...
The status and recent achievements of the electron cyclotron heating system at the stellarator W7-X in Greifswald, Germany are discussed. Three prototype gyrotrons and one from a series of 7 are operable now, one additional is under test. The transmission system is ready up to the stellarator hall; part of it has passed high-power tests (900 kW, 30 min). The test of the multi-beam waveguide is in...
Summary form only given. The development of conventional cavity gyrotrons at 140 GHz with 1-MW, CW output power at Forschungszentrum (FZK) Karlsruhe is mainly linked with the construction of the new superconducting stellarator W7-X at IPP Greifswald, Germany. For W7-X, 10 MW of electron cyclotron heating (ECRH) is planned and will be produced by ten gyrotrons each with a power of 1-MW. The gyrotrons...
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